Economically useful plants of Sri Lanka Part IV* Screening of Sri Lanka Plants for Tannins

Abstract

Several Sri Lankan plants have been assayed for their tannin content. Percenta~ e total tannins as determined by the hide powder method have been compared with the results obtained by the polyclar adsorption method. Infra-red spectroscopy has been used to classify the tannins isolated as either belonging to the condensed type or hydrolysable type. The barks of Carapa granata and Ceriops fagal have been identified as two new tannin rich sources.